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Bitcode: Add METADATA_NODE and METADATA_VALUE

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This reflects the typelessness of `Metadata` in the bitcode format,
removing types from all metadata operands.

`METADATA_VALUE` represents a `ValueAsMetadata`, and always has two
fields: the type and the value.

`METADATA_NODE` represents an `MDNode`, and unlike `METADATA_OLD_NODE`,
doesn't store types.  It stores operands at their ID+1 so that `0` can
reference `nullptr` operands.

Part of PR21532.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224073 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Duncan P. N. Exon Smith
2014-12-11 23:02:24 +00:00
parent f329765d23
commit e39dba9f07
7 changed files with 61 additions and 40 deletions
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21
lib/Bitcode/Reader/BitcodeReader.cpp
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@ -1166,6 +1166,27 @@ std::error_code BitcodeReader::ParseMetadata() {
MDValueList.AssignValue(MDNode::get(Context, Elts), NextMDValueNo++);
break;
}
case bitc::METADATA_VALUE: {
if (Record.size() != 2)
return Error(BitcodeError::InvalidRecord);
Type *Ty = getTypeByID(Record[0]);
if (Ty->isMetadataTy() || Ty->isVoidTy())
return Error(BitcodeError::InvalidRecord);
MDValueList.AssignValue(
ValueAsMetadata::get(ValueList.getValueFwdRef(Record[1], Ty)),
NextMDValueNo++);
break;
}
case bitc::METADATA_NODE: {
SmallVector<Metadata *, 8> Elts;
Elts.reserve(Record.size());
for (unsigned ID : Record)
Elts.push_back(ID ? MDValueList.getValueFwdRef(ID - 1) : nullptr);
MDValueList.AssignValue(MDNode::get(Context, Elts), NextMDValueNo++);
break;
}
case bitc::METADATA_STRING: {
std::string String(Record.begin(), Record.end());
llvm::UpgradeMDStringConstant(String);